低温建筑技术-结构工程Dec.2022No.294DOI：10.13905/j.cnki.dwjz.2022.12.030增大截面加固法对小跨径拱桥承载力影响ONTHEIMPACTOFTHEINCREASEDCROSS-SECTIONREINFORCEMENTMETHODONTHEBEARINGCAPACITYOFSMALLCROSS-BORDERARCHBRIDGES郝小军（重庆路威土木工程设计有限公司，重庆400060）HAOXiaojun（ChongqingLewayCivilEngineeringDesignCo.,Ltd.,Chongqing400060,China）【摘要】为研究增大截面加固法对小跨径拱桥承载能力的影响，以3座跨径分别为10、13、16m的拱桥为研究对象，采用midascivil软件建立全桥有限元模型，并结合相关规范计算了增大截面加固法加固前后拱桥的设计荷载，并基于计算结果，总结了增大截面加固法对小跨径拱桥承载能力的影响，为今后小跨径拱桥的加固提供部分工程经验。计算结果为增大截面加固法可以有效降低截面下缘的拉应力和压应力，但是会增加拱轴线的偏心距，影响拱轴线对恒载压力线的偏离值，因此得出结论，小跨径拱桥的增大截面加固法不能盲目的进行加固，主拱圈应根据自身的拱轴线系数，通过计算确定最优加固厚度，使得加固后截面的偏心距尽量小，以达到最优加固效率。【关键词】拱桥；增大截面加固法；承载能力【中图分类号】TU312【文献标志码】A【文章编号】1001-6864（2022）12-0138-04Abstract：Threearchbridgeswithspansof10m,13mand16mareusedastheresearchobjects.Themidascivilsoftwareisusedtoestablishthefiniteelementmodelofthewholebridge,andthedesignloadsofthefrontandreararchbridgesbeforeandafterthereinforcementmethodarecalculatedincombinationwiththerelevantspecifica⁃tions.Basedonthecalculationresults,theeffectofincreasingthecross-sectionreinforcementmethodonthebear⁃ingcapacityofthesmall-spanarchbridgeissummarized,providingengineeringexperienceforthereinforcementofthesmall-spanarchbridgeinthefuture.Theresultsshowthatthemethodofincreasingthesectionreinforcementcaneffectivelyreducethetensilestressandcompressivestressattheloweredgeofthesection.However,itincreasestheeccentricityofthearchaxisandaffectsthedeviationofthearchaxisfromthedeadloadpressureline.Theopti⁃malreinforcementthicknessofthemainarchringshouldbedeterminedbycalculationaccordingtoitsarchaxisco⁃efficient,soastominimizetheeccentricityofthesectionafterreinforcem...
